Hi Christina! Sorry for the late feedback. Here's my thoughts:1. Weight is working good in both balls. 2. Rotation on both balls could work more naturally. For Heavy ball stop rotation when the ball is not moving any more and for light ball rotation should be half when it's at the top of the arc.Those are the main things you should focus now. Great work!
Oh I just noticed this:Heavy ball's rotation should be really subtle. This will help to the illusion of weight since a heavy ball wouldn't have enough energy off a bounce to rotate that much.